Particles and medical physics: Capacitance Flashcards
1
Q
What is a Capacitor
A
a capacitor is an electricla component that stores charge
2
Q
How is a capacitor constucted
A
2 metal plates separated by a dielectric or empty space
3
Q
how is capacitance defined
A
Capacitance is defined as the change stored per unit p.d. across it
C=Q/V
4
Q
WHat is the unit of capacitance
A
farad (F)
5
Q
For capacitors in parallel how is total capacitance calculated
A
C(total)=C(1)+C(2)+…+C(n)
6
Q
For capacitors in series how is total capacitance calculated
A
1/C(total)=1/C(1)+1/C(2)+…+1/C(n)
7
Q
How do you determine the work done when charging a capacitor
A
area under a p.d-charge graph
8
Q
WHat is the time constant
A
The time it takes for the charge in a cpacitor to fall by 37% of its initial value
